How to Work With a Chinese CNC Machining Supplier

Why buyers come to China for CNC work

Not just price. For many parts the real draw is capacity and turnaround: a shop with 40+ machines can start a prototype the same week and absorb a volume ramp without begging for spindle time. The cost edge is real but it is not automatic — at low quantities, setup and handling can erase it (we wrote about one job where our China quote matched a US shop's: china-quote-matched-us-shop). Source from China for the right reasons, and the relationship holds up.

7 checkpoints before you commit

These are the questions we'd ask any Chinese supplier if we were buying. Most can be answered in one email.

1. Can they show parts like yours?

A photo gallery of real production samples tells you more than a brochure. Look for parts in your material and tolerance range — not catalog renderings. Ours is here.

2. What does the quote actually include?

Setup, programming, material, finishing, inspection and shipping should each be visible or at least explainable. A single buried number hides assumptions. See how to read a quote.

3. How do they protect your IP?

A signed NDA before drawings change hands is the baseline. Ask whether files are deleted on request and whether staff are bound by confidentiality. Grab our free NDA template to set the terms yourself.

4. What inspection comes with the shipment?

100% inspection before shipment, plus CMM reports and material certificates on request. For medical or aerospace, ask about lot traceability and certified-partner arrangements. Our quality process is documented.

5. What are the real lead times?

Prototype (1–100 pcs): often 5–7 working days. Low-volume production (100–10,000 pcs): 2–4 weeks. Beware a shop that quotes the same lead time for both — production needs capacity planning.

6. Which shipping term are you quoting?

EXW (you collect at the factory), FOB (free on board at the port), CIF (cost + insurance + freight to your port), or DDP (delivered, duty paid, to your door). DDP is simplest but the shop carries import duty — confirm it's included so there's no surprise at customs.

7. Who answers after the PO?

A real engineer replying within 24 hours beats a sales bot. Ask who handles RFQs and whether the same person owns your program. Communication lag is the most common cause of delays, not the machines.

Where China sourcing goes wrong

• Chasing the lowest number. The cheapest quote that meets the spec wins; a number that wins by skipping finish or inspection isn't cheaper.
• No NDA, then surprise. Send drawings only after confidentiality is in place.
• Ignoring the shipping term. A low EXW price plus a customs bill can exceed a DDP quote. Compare landed cost, not factory cost.
• No first-article gate. Approve an FAI sample before production; it's the cheapest place to catch an error.

The honest case for and against

We're biased — we're a Chinese shop. So read the candid version: why source CNC from Shenzhen lays out what the city gives you and what it doesn't. If your part needs a certified QMS we don't hold, we'll tell you and point you to a certified partner rather than fake it (see our medical-without-certification note).